In the jungle of central Vietnam lies Son Doong, a magnificent underground cave passage, the largest in the world. Undisturbed for millions of years, its future has been placed in doubt with plans to make it a tourist mecca.
In the jungle of central Vietnam lies Son Doong, a magnificent underground cave passage, the largest in the world. Undisturbed for millions of years, its future has been placed in doubt with plans to make it a tourist mecca.